Alternate Power
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Alternate Power

  1. #1
    Senior Member Can Am 75's Avatar
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    I have an 83 GMC crew cab dually with a 6.2 diesel. I was wondering if anyone on here had any ideas on re powering it. I want to keep it as a diesel. Paul, 71hallet on here has an 83 with a Cummins in it and he loves it. Thinking about having him do this for me but does anyone have any other ideas??

    Brian

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  3. #2
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    The Cummins would be an easy swap for sure and the 5.9 is very reliable and will be night and day over that mighty 6.2. Personally, I'd look into finding a wrecked duramax with an Allison and stuffing that under the hood. Would likely have to do some modification to get the Allison to fit in the tranny tunnel, but would be a sweet rig when done.

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    Senior Member Can Am 75's Avatar
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    That was one I was considering. The guy that I drive for has 03 GMC duramax dually, it tows our 32ft enclosed trailer without breaking a sweat. But I would like to know what all is incolved in it. But sure would be cool. Old truck, new awesome power.

    Brian

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    The 83 doesn't have near the weight of a newer diesel. You will have to upgrade the front springs as a minimum to hold the weight.

    Plan on swapping over the computer controls for the newer motor and trans if you go with the duramax. If you go with an early cummings with mechanical injection then you won't need to mess with the brain transfer.

    Either power plant is going to be a night and day improvemen over what you have now.

    Without saying the exhaust will need to be modified no matter what you do, more so if you go with the straight 6 Cummings.

    And finally, with increased towing power you should look at upgrading the braking power as well.

  7. #5
    Senior Member Can Am 75's Avatar
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    Interesting points for sure. Just this past week the truck got new front springs and new rear springs. The previous owner had lowered it by cutting the coils, rode like crap, wore the new front tires off it. The rear springs are all brand new now. I bought the heaviest springs I could for the front. This is a work truck, hauling trailers and equipment so I want it strong. With regards to the front springs, this may be a dumb question, but a what spring could I put in it other than the heaviest one available for this truck.

    Brian

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    Just Me snoc653's Avatar
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    If they are the heaviest you should be good. That would be the springs for the P/C30 diesel with plow. If you are considering the swap you might check out this link. http://www.dieselpowermag.com/tech/g...wap/index.html

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    Senior Member GRoper's Avatar
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    Quote Originally Posted by Can Am 75 View Post
    The previous owner had lowered it by cutting the coils, rode like crap, wore the new front tires off it. .Brian
    Lowering a diesle truck? Hilariouse!

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    Quote Originally Posted by snoc653 View Post
    The 83 doesn't have near the weight of a newer diesel. You will have to upgrade the front springs as a minimum to hold the weight.
    Actually, if you're talking about the weight of the engines, they're really close. The 6.2 GM is full cast iron and tips the scales around 800 lbs. The Duramax, even with all the computer stuff and turbo on it, has aluminum heads and tips the scales at about 830 lbs. Going to pick up some weight going with the Allison versus the Turbo 400, but nothing to make it ride like a buckboard over.

    Finding the older mechanical 12 valve 5.9 Cummins is definately a simpler way to go, however, if you're looking for the oomph of the newer ones, I'd deal with the electronics and do the swap with a newer one with lots more options.

  11. #9
    Senior Member Can Am 75's Avatar
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    I think I will look for the Cummins, sounds like the easiest way to go. What years should I be looking for and are there any other things that I should look for? Got the truck back today from the alignment shop so it was the first time I drove it with the new springs, much better now. Need to get it work now to pay for last weeks work.

    Brian

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